While the packages do remain in the archive, that fact is not displayed on the PPA page unless you explicitly tell it to show superseeded packages. That is what I think needs to be fixed, though I admit this is a very minor bug.
While the packages do remain in the archive, that fact is not displayed on the PPA page unless you explicitly tell it to show superseeded packages. That is what I think needs to be fixed, though I admit this is a very minor bug.